UTC34119

UTC34119 DESCRIPTION LI NEAR I NTEGRATED CI RCUI T LOW POWER AUDIO AMPLIFIER The UTC34119 is a low power audio amplifier integrated circuit intended (primarily) for the telephone applications, such as in speakerphones. It provides differential speaker outputs to maximize output swing at low supply voltages. Coupling Capacitor to the speaker are not required. Open loop gain is 80dB, and the closed loop gain is set with two external resistors. A chips Disable pin permits powering down and/or muting the input signal. FEATURES *Wide operating supply voltage: Vcc=2~16V *Low quiescent supply current(Icc=2.7mA,typical) *Medium output power Po=250mW at Vcc=6V,RL=32ohm ,Thd=10% *Load Impedance range(8 ohms to 100 ohm) *Low distortion *Mute function(Icc=65µA, typical) *Minimum number of external parts required. DIP-8 BLOCK DIAGRAM Inverting Input NonInverting Input 4 3 Amp 1 R R 5 Output 1 Amp 2 8 1 Output 2 Vcc 6 Bias MUTE 2 Ripplie Rejection 7 GND YOUW ANG ELECTRONI CO. CS LTD 1 UTC34119 Characteristic Supply Voltage Output Current Maximum input ,ripple rejection, Mute pin voltage Applied output voltage(output pin when disabled) Junction Temperature LI NEAR I NTEGRATED CI RCUI T Symbol Vcc Io Vi(max) Vo Tj ABSOLUTE MAXIMUM RATINGS(Ta=25°C) Value -1.0~+18 ±250 -1.0~Vcc+1.0 -1.0~Vcc+1.0 -55 ~ +150 Unit V mA V V °C PIN DESCRIPTION Pin No. 1 Symbol Mute Description This pin can be used to power down the IC to converse power, or for muting, or both. When at a logic “LOW”(less than 0.8V), the IC is enabled for normal operation. When at a logic “HIGH”(2.0V ~Vcc), the IC is disabled. If Mute is open, that is equivalent to a logic “LOW”. A capacitor at this pin increase power supply rejection, and affects turn-on time. This pin can be left open if the capacitor at pin 1 is sufficient. Analog Ground for the amplifiers. A 1.0­F capacitor at this pin (with a 5.0­F capacitor at pin 8) provides 52dB(typical) of power supply rejection. Turn-on time of the circuit is affected by the capacitor on this pin. This pin can be used as an alternative input. Amplifier input. The input capacitor and resistor set low frequency roll-off and input impedance. The feedback resistor is connected between this pin and output 1. Amplifier a’s output. The DC level is about (Vcc-0.7V)/2. DC supply voltage is applied to this pin(Vcc=2.0V ~16.0V) Ground pin Amplifier 2’s output. This signal is equal in amplitude, but 180° out of phase with that t output 1 the DC level is about(Vcc-0.7V)/2. 2 3 Ripple Rejection Input(+) 4 5 6 7 8 input(-) Output 1 Vcc GND Output 2 RECOMMENDED OPERATION CONDITIONS(Ta=25°C) Characteristics Supply Voltage Load Impedance Peak Load Current Differential Gain(5kHz Bandwidth) Voltage at Mute Ambient temperature Symbol Vcc ZL IL(peak) ∆ GV Vi(mute) Ta Min 2.0 8 0 0 -20 Typ Max 16 100 ±200 46 Vcc 470 Unit V Ω mA dB V °C YOUW ANG ELECTRONI CO. CS LTD 2 UTC34119 ELECTRICAL CHARACTERISTICS Characteristic DC Characteristics Operating current Icc (Ta=25°C,Vcc=6V,unless otherwise specified) LI NEAR I NTEGRATED CI RCUI T Symbol Test Conditions Vcc=3.0V, Mute=0.8V Vcc=16.0, Mute=0.8V Vcc=3.0V,Mute=2.0V RL=16Ω R1=75kΩ Vcc=3.0V Vcc=6.0V Vcc=12.0V Vcc=6.0V,Rf=75kΩ,RL=32Ω 2.0V